<template>
    <div>
      <!-- 面包屑组件-->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
      </el-breadcrumb>

      <!--卡片视图区域 -->
      <el-card>
        <!--提示区域 -->
        <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
        <!--步骤条 -->
        <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
          <el-step title="基本信息"></el-step>
          <el-step title="商品参数"></el-step>
          <el-step title="商品属性"></el-step>
          <el-step title="商品图片"></el-step>
          <el-step title="商品内容"></el-step>
          <el-step title="完成"></el-step>
        </el-steps>

        <!--tag标签左边区域 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef"
                 label-width="100px" label-position="top">
        <el-tabs :tab-position="'left'"  v-model="activeIndex"
                 :before-leave="beforeTableLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price" type="number">
              <el-input v-model="addForm.goods_price"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight" type="number">
              <el-input v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number" type="number">
              <el-input v-model="addForm.goods_number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="{ expandTrigger: 'hover', label:'cat_name', value:'cat_id', children:'children'}"
                @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!--渲染表单的Item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyDataTable"
                          :key="item.attr_id" >
             <!--复选框组 -->
                <el-checkbox-group v-model="item.attr_vals">
                  <el-checkbox :label="cb"  v-for="(cb,i) in item.attr_vals"
                               :key="i" border></el-checkbox>
                </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>

          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyDataTable"
                          :key="item.attr_id">
              <el-input v-model="item.attr_name"></el-input>
            </el-form-item>

          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!--上传图片区域 action为上传图片的后台接口 -->
            <el-upload
              action="https://www.liulongbin.top:8888/api/private/v1/upload"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
            :headers="headerObj"
            :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
              <!--<div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>-->
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!--负文本编辑器 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
          </el-form>
      </el-card>

      <!--图片预览区域 -->
      <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="50%">
        <img :src="previewPath" alt="" class="previewImg">
      </el-dialog>
    </div>
</template>

<script>
  //导入深拷贝的包，来拷贝addForm，保证不冲突，将数组转换为字符串
  import _ from 'lodash'
    export default {
        name: "Add",
      data() {
          return {
            activeIndex: '0',
            //添加商品对象
            addForm: {
              goods_name: '',
              goods_price: 0,
              goods_number: 0,
              goods_weight: 0,
              //商品所属的分类数组
              goods_cat: [],
              //图片的数组
              pics: [],
              //商品的详情描述
              goods_introduce: '',
              attrs: []
            },
            addFormRules:{
              goods_name:[{required: true, message: '请输入商品名称', trigger: 'blur'}],
              goods_price:[{required: true, message: '请输入商品价格', trigger: 'blur'}],
              goods_weight:[{required: true, message: '请输入商品重量', trigger: 'blur'}],
              goods_number:[{required: true, message: '请输入商品数量', trigger: 'blur'}],
              goods_cat:[{required: true, message: '请选择商品分类', trigger: 'blur'}]

            },
            //商品分类列表
            cateList: [],
            //动态参数列表数据
            manyDataTable: [],
            onlyDataTable: [],
            //图片上传组件的headers请求头对象
            headerObj: {
              Authorization: window.sessionStorage.getItem('token')
            },
            previewPath: '',
            previewVisible: false

          }
      },
      created() {
          this.getCateList()
      },
      methods: {
          async getCateList() {
           const{data: res} = await this.$http.get('categories')
            if(res.meta.status !== 200){
              return this.$message.error('获取商品分类数据失败！')
            }
            this.cateList = res.data
            //console.log(res.data)
          },
        //级联选择器选择器变化触发函数
        handleChange() {
            //console.log(this.addForm.goods_cat)
          if(this.addForm.goods_cat.length !== 3){
            this.addForm.goods_cat =  []
          }
        },
        //如果没有选择三级分类就不进行跳转
        beforeTableLeave(activeName,oldActiveName) {
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
              this.$message.error('请先选择商品分类！')
              return false
            }
        },
        //点击tag标签是触发
        async tabClicked() {
            //console.log(this.activeIndex)
          if(this.activeIndex === '1'){
           const{data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
              {params: {sel: 'many'}})
            if(res.meta.status !== 200){
              return this.$message.error('获取动态参数数据列表失败！')
            }
            //console.log(res.data)
            res.data.forEach(item => {
              item.attr_vals = item.attr_vals.length === 0 ? []: item.attr_vals.split(',')
            })
            this.manyDataTable = res.data
          }else if(this.activeIndex === '2'){
            const{data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
              {params: {sel: 'only'}})
            if(res.meta.status !== 200){
              return this.$message.error('获取静态属性数据列表失败！')
            }
            this.onlyDataTable = res.data
          }
        },
        //处理图片预览函数
        handlePreview(file) {
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        //关闭移除图片处理函数
        handleRemove(file) {
            //1.获取将要删除的图片临时路径
          const filePath = file.response.data.tmp_path
            //2.从pics数组中，找到图片索引值
          const i = this.addForm.pics.findIndex(x => x.pics === filePath)
            //3.调用数组的splice方法，把图片信息从数组中移除
          this.addForm.pics.splice(i,1)
        },
        //监听图片上传成功的函数
        handleSuccess(response) {
            //1.先拼接得到一个图片信息对象
          const picInfo = {pic: response.data.tmp_path}
            //2.将图片信息对象push到pics对象中
          this.addForm.pics.push(picInfo)
          //console.log(this.addForm)
        },
        //添加商品
        add() {
            this.$refs.addFormRef.validate(async valid => {
              if(!valid){
                return this.$message.error('请填写必要的表单项！')
              }
              //执行添加逻辑,深拷贝方式：1.JSON 2.lodash的cloneDeep
              const form =_.cloneDeep(this.addForm)
              form.goods_cat = form.goods_cat.join(',')
              //处理动态参数
              this.manyDataTable.forEach(item =>{
                const newInfo = {
                  attr_id: item.attr_id,
                  attr_value: item.attr_vals.join(',')
                }
                this.addForm.attrs.push(newInfo)
              })
              //处理静态属性
              this.onlyDataTable.forEach(item =>{
                const newInfo = {
                  attr_id: item.attr_id,
                  attr_value: item.attr_vals
                }
                this.addForm.attrs.push(newInfo)
              })
              form.attrs = this.addForm.attrs
              console.log(form)
              //发起请求，添加商品，名称唯一
              const {data: res} = await this.$http.post('goods', form)
              if(res.meta.status !== 201){
                return this.$message.error('添加商品失败！')
              }
              console.log(res)
              this.$message.success('添加商品成功')
              this.$router.push('/goods')
            })
        }
      },
      computed: {
          cateId() {
            if(this.addForm.goods_cat.length === 3){
              return this.addForm.goods_cat[2]
            }
            return null
          }
      }
    }
</script>

<style lang="less" scoped>
.el-checkbox{
  margin: 0 5px 0 0 !important;
}
  .previewImg{
    width: 100%;
  }
  .btnAdd{
    margin-top: 15px;
  }
</style>
